Android 在同一imageView中使用动态url和图像

我有一个imageView，我的布局名称是iv1

我想当用户离线时，它会显示一个图像和一个默认的url链接。 但当用户上网时，我想从url和动态url的图像链接获得图像

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如何做，任何好的做法..请创建一个名为

ConnectionDetector

   public class ConnectionDetector {

    private Context context ;
    WifiManager wifiManager ;
    static WifiInfo wifiInfo ;

    public final static String internetError = "No Internet Connection";

    public ConnectionDetector (Context context)
    {
        this.context = context ;
        wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        wifiInfo = wifiManager.getConnectionInfo();
    }

    public boolean isInternetConnected()
    {
        ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        if(connectivity != null)
        {
            NetworkInfo[] info = connectivity.getAllNetworkInfo();

            if (info != null)
            {
                for(int i = 0; i < info.length ; i++)
                {
                    if(info[i].getState() == NetworkInfo.State.CONNECTED)
                    {
                        return true;
                    }
                }
            }

        }

        return false;
    }

}

ConnectionDetector cd = new ConnectionDetector (getApplicationContext());
boolean isConnected = cd.isInternetConnected();

if (isConnected)
{
    // Internet is present, here you can download the image from URL and set it to ImageView. If you're new to image downloading then better use picasso library. It's only 1 line of code. 
}

else
{
    // No internet connection, you can display default image and url in your imageview
}